Sintering pan and grate therefor



G. L. SHOOK SINTERING PAN AND GRATE THEREFOR- Filed Feb. 21, 1925 u "E L Iii July 59 I N V EN TOR. Z/ZZZM A TTORNEY.

M .v g I l: 5

July 5, 1927.

srares GEORGE L. SHQQK, 0F PORT HENRY, NEW YORK.

SIN'I'ERING PAN AND GBA'I'E Application filed February 21, 1925; Serial No. 10,949.

for the troduction into the usual blast furnace, is becoming general practice. Such pans coin prise a considerable number of rocking grate-bars which rock under the urge of counter-weights as the pan is tipped. These grate-bars are trunnioned and are mounted in end dead-bars and transverse trunnion-bars so as to normally lie in juxtaposition. The counter-weights which control the grate-bars are either dependent therefrom or contact with arms which are. Each weight is usually connected to more than one of the bars so that the bars are forced to act in unison, although individual counter-weights for the bars may be used to advantage under some conditions.

In the present type of grate-bars used in sintering pans, the trunnions are formed by introducing a length of steel rod longitudinally therethrough, the length of the rod being enough greater than the overall length of the bar so that a partthereot will project beyond each end t erect when the rod is fastened in place.

Sintering pans and their contents are subjected to high temperatures and the gratebars frequently become warped and burned to a degree which interferes with the perfeet working of the pan and IHdSil be replaced. The transverse trunniou-bars, and the fastening bolts used to attach them in place, frequently become distorted to an extent which requires them to be replaced by others. In sintering pans the grate-bars are ordinarily placed in gangs of tour or more bars, and to replace a couple of warped or burned out bars of the usual type may require the removal of two of such gangs. It is not usually possible to remove a single bar and to replace it by another of the usual types without first removing the whole of a gang. In sintering pans having grate-- bars of the usual types, mounted and construeted as is the present practice, the replacement of either grate-bars or trunnionbars is a lengthy and expensive operation. The length of time required to make such repairs requires the pan to be out of service for a very considerable period of time and may reduce the output of the whole plant by reason thereof. 4

treating of iron ore prior to its in- A single gratebar such as are used in use pans weigh "from eighty to tWo hunpounds, and if it be of the type to h a counter-weight is directly attached thev wei ht 1 a a d as much more to the amount wli'ich be handled in order to make a-replacement. The grate-bars in sintering pans lie close to each other, in some cases being separated by only one eighth of an inch, and to gethold of a bar in a manner which permits the easy removal from, or placement in position in the pan is a difli cult matter with present bars.

The object of this invention is to so imp eve the manner of forming and mounting the trunnio'ns in the bars that individual grate-bars may be inserted in present pans with but little troub e and in a minimum of time. The manner in which I accomplish my. object is illustrated in the accompanying drawings, in which:

Fig. 1 is a cross section through one of the end dead-bars and one of the trunnion- "s, showing one of my improved gratehars in place.

Fig. 2 is a detail illustrating the location of the trunnion pins while placing the bar in position for them to be entered in their sociret hearings in the end dead-bars or the trunnion-bars.

Figs. 3 and 4: modified I the side opening adapted to admit the means for holding the pi: n adjusted position atter it has been forced into its bearing.

The same pa s throughout the several views.

Referrng to the drawings, A represents a portion or the trams of a sintering pan, B an end dead-bar, C a trunnion-bar, and l) a trunnion-bar fastening bolt. E represents my improved grate-bar; F, F the trunnion pins; G the usual counter-weights; and H the counter-weight arm dependent from the grate-bar. .lrepresents a granular filling n'iaterial such as iron chips, or crushed cinder; K a threaded opening, and KP a plug adapted to close the same and prevent the filling from escaping.

To remove a distorted or otherwise detective part, as a grate-bar, trunnion-bar, or bolts from a sintering pan it is the common practice to cut the damaged parts with are details illustrating a a cutting torch so that they may be readily removed from the apparatus. When for any reason it becomes necessary to remove a torin of trun'nionpin socket and retercnce characters refer to the grate-bar, it is a simple matter to out off the trunnions at the ends so that the bar may be lifted out, but as the bars are heavy and lay close together it is not an easy matter under usual conditions to get a hold on the bar so as to handle it with ease. I plan, however, to drill and tap a hole (or holes) therein adapted to receive an eye bolt which can be readily attached to suitable lifting apparatus, and to initially provide my improved bars with like holes so that they may be easily handled when it is desired to place them in a pan when making replacements.

In my improved sintering pan grate-bar I form a trunnion-pin socket in each end thereof, these sockets preferably adapted to fit closely but slidably the trunnion pins F, and having a depth about equal to the length of the trunnion-pins. Opening into these sockets, at or near the bottom thereof, are side openings adapted to have introduced therein a suitable tool whereby the pins may be forced outward and into the bearings adapted to receive them. These side openings are also adapted to have introduced therethrough some suitable means for preventing the trunnion pin from moving inward after the same is introduced into its proper bearing. This means may be a wedge block adapted to be fastened in place by being hammered so as to expand the inner edge thereof, or it may be a thin .edge wedge piece so shaped that the bottom edge will curl when the wedge is hammered into place. However I now prefer to Wedge the pins against inward movement by introducing into the space between the bottom of the socket and the rear end of the pin when it is in adjusted position, a suitable granular material such as iron chips, or crushed cinder, packing the space full then introducing a plug to prevent its escape. This granular packing may be in loose form or it may be combined with a suitable cementing element such as a plastic compound which will harden under heating.

In some instances a single slidable trunnion-pin will be all that is required in order to permit the lowering of grate-bar into place between the bearings adapted to carry it. In such a case a permanent trunnion may be used on one end.

I claim:

1. In a grate bar, the combination of a revoluble body with a socket in each end thereof, side openings leading from points near the bottoms of said sockets to the front face of the bar and through which trunnion pins in place in the sockets may be manipulated so as to be moved outward as into their appointed bearings trunnion pins slidable in said sockets, the length thereof substantially equal to the depth of the sockets; granular material, as for instance crushed cinders, inserted through said side openings after the trunnion pins have been moved outward; and means for retaining said granular material in place whereby return movement of the trunnion pins is prevented.

2. In combination, a revoluble body hav ing a longitudinal socket at each end, and a transverse bore opening into said socket adjacent the closed end thereof, a trunnion pin slidably mounted in each socket and adapted to be moved outwardly by a tool adapted to be inserted in said bore, means adapted to be poured through said bore into the socket to prevent endwise movement of the pin in one direction, and a removable plug normally closing said bore.

In testimony whereof I have affixed my signature.

GEORGE L. SHOOK. 

